<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		<script>
			var a = 10;
			var b = 20;
			console.log(a,b);
			[a,b] = [b,a];
			console.log(a,b);
		</script>
	</body>
</html>
